As the first step toward modifying the hybrid system, I installed a "current hack", courtesy of Peter Perkins, on Insight Central. This can be done purely with resistors, but Peter's PCB is inexpensive and convenient.
The hack requires a resistor to be placed in the battery control module (BCM), and either Peter's PCB, or another set of resistors, in the motor control module (MCM). These sit on top of the battery pack. The main fuse also needs to be increased from 100 amps to at least 150 amps. Fortunately, the Fit Hybrid battery packs come with a compatible 150 amp fuse.
Battery case revealed, after picking up the carpet:
Battery cover removed:
New fuse:
Fuse installed in the battery pack:
Resistor added to the BCM:
PCB added to the MCM:
